CONFIG_DEBUG_S3C2410_UART is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

S3C2410 UART to use for low-level debug

configname: CONFIG_DEBUG_S3C2410_UART

Linux Kernel Configuration
└─>Kernel hacking
└─>S3C2410 UART to use for low-level debug
In linux kernel since version 2.6.12  
Choice for UART for kernel low-level using S3C2410 UARTS,
should be between zero and two. The port must have been
initialised by the boot-loader before use.

The uncompressor code port configuration is now handled
by CONFIG_S3C2410_LOWLEVEL_UART_PORT.